Viking’s cULus Listed VK449 K4.0 residential dry horizontal sidewall (HSW) sprinkler can be installed in spaces subject to freezing, such as balconies and garages, and supplied from a wet system in a heated area, penetrating the wall to protect the hazard in areas subject to freezing. The VK449 is compatible with a wide range of pipe fittings, making it suitable for a variety of residential piping choices.